From 3f96750bece9167e25e52a61c1f52cdcdecdb8ea Mon Sep 17 00:00:00 2001
From: Wen <wenslife@outlook.com>
Date: Tue, 30 Aug 2022 22:30:25 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96=20242.=20=E6=9C=89=E6=95=88?=
 =?UTF-8?q?=E7=9A=84=E5=AD=97=E6=AF=8D=E5=BC=82=E4=BD=8D=E8=AF=8D=20Java?=
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---
 problems/0242.有效的字母异位词.md | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/problems/0242.有效的字母异位词.md b/problems/0242.有效的字母异位词.md
index 87302482..d54285eb 100644
--- a/problems/0242.有效的字母异位词.md
+++ b/problems/0242.有效的字母异位词.md
@@ -92,18 +92,24 @@ public:
 
 Java：
 ```java
+/**
+ * 242. 有效的字母异位词 字典解法
+ * 时间复杂度O(m+n) 空间复杂度O(1)
+ */
 class Solution {
     public boolean isAnagram(String s, String t) {
-
         int[] record = new int[26];
-        for (char c : s.toCharArray()) {
-            record[c - 'a'] += 1;
+
+        for (int i = 0; i < s.length(); i++) {
+            record[s.charAt(i) - 'a']++;
         }
-        for (char c : t.toCharArray()) {
-            record[c - 'a'] -= 1;
+
+        for (int i = 0; i < t.length(); i++) {
+            record[t.charAt(i) - 'a']--;
         }
-        for (int i : record) {
-            if (i != 0) {
+        
+        for (int count: record) {
+            if (count != 0) {
                 return false;
             }
         }